Enhanced lithium ionic conductivity of lithium perchlorate in the metal-organic framework matrix

Nanocomposite solid electrolytes were prepared by impregnation of LiClO 4 into pores of the metal-organic framework Cr 3 [C 6 H 4 (COO) 2 ] 3 F (MIL-101(Cr)), and their conductivity was investigated. At temperatures 25–150 °C and relative humidity of 50%, the composites easily absorb water with form...

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Veröffentlicht in:Ionics 2020-12, Vol.26 (12), p.6167-6173
Hauptverfasser: Ulihin, Artem, Ponomareva, Valentina, Uvarov, Nikolai, Kovalenko, Konstantin, Fedin, Vladimir
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Sprache:eng
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Zusammenfassung:Nanocomposite solid electrolytes were prepared by impregnation of LiClO 4 into pores of the metal-organic framework Cr 3 [C 6 H 4 (COO) 2 ] 3 F (MIL-101(Cr)), and their conductivity was investigated. At temperatures 25–150 °C and relative humidity of 50%, the composites easily absorb water with formation liquid phase in the pores and have conductivity values typical for water solutions. Conductivity decreases with diminishing the humidity; however, complete dehydration may be achieved only after prolonged heating in vacuum at 180 °C. The concentration dependence of conductivity of dehydrated samples goes through the maximum at nearly 6 mol% of MIL-101(Cr) and reaches 3 × 10 −3  S/cm at 160 °C; the activation energy decreases in the nanocomposites. Using the volt-amperometric technique on the sample with two nickel electrodes, the electrochemical decomposition voltage value was found to be nearly 3.5 V at 160 °C. It suggests that the ionic conductivity is caused by lithium cations rather than protons or electrons.
ISSN:0947-7047
1862-0760
DOI:10.1007/s11581-020-03772-6